Sensitivity of the surrogate analysis method to synchronization and conduction velocity of muscular fibers

This paper shows that conduction velocity (CV) and motor unit action potential (MUAPs) synchronization affects the results of Surrogate Analysis (SA) surface electromyography (sEMG) signal. It will be verified if SA can extract information from sEMG Also, it is first time interpreted a physiological point-of-view. To illustrate relationships between CV, SA, simple dipole-based model for signal simulation used. composed multiple fibers superposed at same location, leaving aside any complex geometrical considerations, but putting emphasis on timing MUAPs firing. Single-pulse as well impulse train are studied. highlight difference spectral (linear) features, nonlinear features relation with parameters, Median Frequency (MDF), Kurtosis, Higuchi’s Fractal Dimension (FD) FD based compared. The show jointly influenced by CV synchronization, almost in multiplicative way. These relations also more pronounced an than single pulse. Overall, shown to good feature consider estimation. moreover uncorrelated moderately features. findings used 1) help evaluate 2) interpret result surrogate analysis.